Abstract
Ceramic prostheses are subject to sliding contact under normal and tangential loads. Accurate prediction of the onset of fracture at two contacting surfaces holds the key to greater long-term performance of these prostheses. In this study, building on stress analysis of Hertzian contact and considering fracture criteria for linear elastic materials, a constitutive fracture mechanics relation was developed to incorporate the critical fracture load with the contact geometry, coefficient of friction and material fracture toughness. Critical loads necessary to cause fracture under a sliding indenter were calculated from the constitutive equation, and compared with the loads predicted from elastic stress analysis in conjunction with measured critical load for frictionless normal contact - a semi-empirical approach. The major predictions of the models were calibrated with experimentally determined critical loads of current and future dental ceramics after contact with a rigid spherical slider. Experimental results conform with the trends predicted by the models.
Original language | English (US) |
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Pages (from-to) | 3243-3253 |
Number of pages | 11 |
Journal | Acta Biomaterialia |
Volume | 10 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2014 |
Keywords
- Dental ceramics
- Friction
- Functionally graded ceramics
- Sliding contact fracture
- Toughness
ASJC Scopus subject areas
- Biotechnology
- Biomaterials
- Biochemistry
- Biomedical Engineering
- Molecular Biology